Amphicoelous centra often are integrated with a full notochord . " Procoelous " vertebrae are anteriorly concave and posteriorly convex.
12.
The vertebrae were amphicoelous and constricted at the waist, with a length of about three centimetres and somewhat taller than wide in cross-section.
13.
These flat ends of the centra are especially good at supporting and distributing compressive forces . " Amphicoelous " vertebra have centra with both ends concave.
14.
Amphicoelous vertebral centra are a little unusual in a ( relatively ) powerful carnivore, but this was the primitive and usual condition for early synapsids of all types.
15.
These traits include : vestigial tail-wagging muscles, cartilaginous inscriptional ribs, the presence of amphicoelous vertebrae, and nine presachral vertebrae ( most frogs have eight ).
16.
The centra possess amphicoelous articulations with the pertinent facets of an intermediate nature between the circular ones of " Ilokelesia " and those of the elliptical persuasion in " Rajasaurus " and have neither pneumatic recesses nor accessory hyposphene-hypantrum articulations.
17.
The generic name refers to Rinc�n de los Sauces, where the fossils were discovered, while the specific name, " caudamirus ", means " amazing in the tail " in Latin, in reference to the unusual shape of the tail vertebrae, especially a strange sequence of procoelous, amphicoelous, opisthocoelous, biconvex and ultimately again procoelous vertebrae shown by one individual.
